protected override async Task RunAsync(CancellationToken cancellationToken)
{
TimeSpan timeSpan = new TimeSpan(0, 0, 30);
ServiceEventSource.Current.ServiceMessage(
this,
"Partition {0} started processing messages.",
this.ServicePartition.PartitionInfo.Id);
IReliableDictionary <DateTime, Message> messagesDictionary =
await this.StateManager.GetOrAddAsync <IReliableDictionary <DateTime, Message> >("messages");
//Use this method to periodically clean up messages in the messagesDictionary
while (!cancellationToken.IsCancellationRequested)
{
try
{
// Remove all the messages that are older than 30 seconds keeping the last 3 messages
IEnumerable <KeyValuePair <DateTime, Message> > oldMessages = from t in messagesDictionary
where t.Key < (DateTime.Now - timeSpan)
orderby t.Key ascending
select t;
using (ITransaction tx = this.StateManager.CreateTransaction())
{
foreach (KeyValuePair <DateTime, Message> item in oldMessages.Take(messagesDictionary.Count() - MessagesToKeep))
{
await messagesDictionary.TryRemoveAsync(tx, item.Key);
}
await tx.CommitAsync();
}
}
catch (Exception e)
{
if (!this.HandleException(e))
{
ServiceEventSource.Current.ServiceMessage(
this,
"Partition {0} stopped processing because of error {1}",
this.ServicePartition.PartitionInfo.Id,
e);
break;
}
}
await Task.Delay(TimeSpan.FromSeconds(2), cancellationToken);
}
}